Image forming apparatus
AssigneeBrother Kogyo Kabushiki Kaisha
InventorRyohei NAKAGAWA
Life of this patent
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Abstract
An image forming apparatus, having an exposing unit for exposing a photosensitive body to form an latent image, a developing unit for forming a developer image corresponding to the latent image, a carrier body moved through a portion opposite to the photosensitive body onto which the developer image formed on the photosensitive body is transferred, a mark forming unit for controlling the exposing unit to form a mark on a surface of the carrier body, light a sensor for sensing light reflected by the carrier body, an edge detector for sensing an edge of the mark on the carrier body based on output of the light sensor and a deciding unit for deciding a positional relation between a focal point of the exposing unit and the surface of the photosensitive body based on the edge detected by the edge detector.
Claims8
An image forming apparatus, comprising:
- a photosensitive body;
- an exposing unit which exposes a surface of the photosensitive body to form an electrostatic latent image on the surface of the photosensitive body;
- a developing unit which attaches a developer to the electrostatic latent image to form a developer image corresponding to the electrostatic latent image formed on the surface of the photosensitive body;
- a carrier body, which is moved through a portion opposite to the photosensitive body and onto which the developer image formed on the photosensitive body is to be transferred;
- a mark forming unit which controls the exposing unit to form a mark made from the developer image on a surface of the carrier body;
- a light sensor which senses light reflected by the carrier body;
- an edge detector which senses edges of the mark formed on the surface of the carrier body based on an output of the light sensor;
- and
- a deciding unit which decides a positional relation between a focal point of the exposing unit and the surface of the photosensitive body based on the detected edge detected by the edge detector.
Dependencies are inferred from the claim text.